graves



(No Mddel.)

' P. B. GRAVES.

SLACK CABLE STOP.

Patented July 10, 18 88.

K\ Wit has Ses B WM hvs fltior he N. PETERS. Phowucnn mbher. Wnhingion.me

Nrrnn STATES AENT Eric.

FRED B. GRAVES, OF ROCHESTER, NEWV YORK, ASSIGNOE IO L. S. GRAVES 86SON, OF SAME PLACE.

SLACK-CABLE. STOP.

SPECIFICATION forming part of Letters Patent No. 385,754, dated July 10,1888. Application filed March 2.6, i858. Serial No. 169,587. (No model.)

To all whom it may concern: one end said frame andsupported in bearingsBe it known that I, FRED B. GRAVES, of is a shaft, B, on which run thefast and loose Rochester, in the county of Monroe and State pulleys B B,adapted to be driven by suitable of New York, have invented certain newand belts from the prime mover in the ordinary 55 useful Improvements inSlack-Gable Stops for manner. Elevators; and I do hereby declare thefollow- G represents an intermediate counter-shaft. ing to be a full,clear, and exact description having pinions O gearing with pinion B ofthe same, reference being had to the acconion shaft B and gear D, formedon the windingpanying drawings,formingapart of this specidrum 1), asshown. The shaft D on which 60 IO fication, and to the figures andletters of referthe drum D is mounted, is provided on one end encemarked thereon. with an extended portion, D threaded at (Z, My presentinvention relates to improve- 1 and upon this threaded portion aresecured ments in slaclccable stops for elevators, partwo two-part nutsor stops, E E, capable of ticularly to that class adapted to be appliedto being adjusted, but normally held clamped a 6 I 5 the ceilings ofrooms, and to hang suspended certain distance apart, regulated by theheight therefrom, and it has for its object to improve of the buildingand length of cable employed. and cheapen their construction andsimplify On the outer end of the drum-shaftis secured their operation;andit consistsin certain novel a collar, (1, and between this and theouter combinations of parts hereinafter described, of the stationarynuts is hung one end of a vi- 7( 2c and pointed out particularly in theclaims at bratory frame, F, the other end being hung the end of thisspecification. 1 upon the shaft between the inner stationary In thedrawings, Figure 1 is a perspective nut and the bearing of the mainframe, and on view of ahoisting-machine with my invention the threadedportion between the stops E E applied thereto, Fig. 2, a bottom planview is arranged amovable threaded nut, G, having 7 of the machine,showing more clearly the dean extension, Gr, entering a slot, F, in thevitails of my improvement. Fig. 3 is an enlbratory frame, the latterbeing of such length larged sectional view of the clutch of the auas topermit the free movement of the nut tomatic stop mechanism. whiletraveling until it strikes one or the other Similar letters of referencein the several of the stopsE. o figures indicate the same parts. At theend of the frame opposite the drum It is well known that frequentlyserious acis provided a short shaft, H, on which is cidents result fromthe arrest of elevators while mounted the hand-rope wheel H, to which isdescending while the suspending-cable is conconnected the hand-rope,which runs in proxtinually unwinding, leaving the car suspended imity tothe car, and is manipulated by the operator to control the operation ofthe machine.

at the mercy of the obstruction, and devices known as slacl -eable stopshave been pro- On one side this wheel islocated the cam I, vided for thepurpose of preventing these by operating through projection 1 upon rodI", to arresting the motion of the cable-containing which thebelt-shifters are connected. To the drum, and my present invention isdesigned shaft H is connected a cam, H, adapted to to provide animproved device for this purmove the end of a lever, II, carrying abrakc pose. arranged to be applied to the fast pulley or its Theconstruction of the hoisting-machine shaft when operated in onedirection. Th to which the invention is shown herein apextreme of theshaft is provided with a sector plied forms no part of the invention,except J, engaging a rack, J, arranged to slide i in so far as specifiedin the claims, and I do suitable guides, and connected by a rod, J notdeem it necessary to enter into a minute with the extension of thevibrating frame F,2 description of all the operative parts thereof.shown.

Ain the drawings represents the main frame From the above it will beseen that the o or base, adapted to be secured to the ceiling of eratornormally controls the movements of ti 0 a room, and provided withsuitable bearings elevator by the hand-rope, operating thebel andjournals for the operating-shafts. Near shifter and pulley-brake; but asthe nut G caused to travel in one or other direction, 210- and F,

cording to the dlrectlon of movement of shaft,

when the extreme of the movement of the cal edevlce above d 1s reached,said nut will stiike one of the sto s applied,and I have and beprevented from further rotation "his for the purpose.

to those skilled in the art, and I do not desire to be limited more thanis specified in the claims.

Having thus described my invention, what claim as new is t 1. In ahoisting-machine, the combination of the starting and stoppingmechanism, the winding-drum, the shaft for the same, haying the portionextending beyond the bearing, the vibrating On the side of the innerextension of frame F are provided teeth or projeetionsf, forming engagecorresponding teeth on a clutch-section, J, con- D', so as to rotatetherewith, by a spline-andgroove connection, and capafa reciprocatingmotion thereon, so as to be engaged and disengaged when desired. Agroove is formed in section J, in which is located a collar, j,connected to hell-crank lever, other arm being connected with shalt M bymeans of a link, M,

The

projecting arm, 1W,

' d for a portion of ping mechanism, the

his an adjustable nut, m, for the same, having the threaded portlonand da perforated projecn the main frame, through which the 121 operating tomove direction to throw the clutch out of engagement.

rojecting slightly down ward from the shaft, and extending under thewinding-drum and in closeproximity to its surface, is a U-shaped frame,N, rigidly attached to means of the collars n 11 shown, or othersuitablefasteningdcvice. The relation which this nected thereto, theshaft frame bears to the bell crank and shaft is frame mounted thereon,

the connecting-link between the franieshaft such that a movement of theformer away from extending close to the periphery of the drum, the drumw1ll cause the engagement of the and a connectlng-lod between thebell-crank clutch section, while a lcverse movement and the shaft,uheieby a movement imparted caused by the spring m will unclutch them.From the above the operation of this device will be apparent.

Under normal conditions the frame N is close to the drum and the clutchuncoupled,- happen that while the d the cardescending the latter shouldbe caught,

PIOJGCE from the drums surface, upon striking the frame spring m andthrough the link move the rotating clutchseetion J gagement with theside of the vibrating frame F, causing the vibr' hrough theconnecting-rod, rack, sector, and :haft H causing the shifting of thebelt, ap-

projection frame attached to said last- )lication of the brake, and astoppage of he scribe :iachine. FRED B. GRAVES. Upon the removal of thecoil of the cable Witnesses:

cm the frame the spring m returns it to Z. L. DAVIs,

)rmal position, LORENZO S. GRAVES.

unclntching the sectors J tcoursc numerous modifications will occur

